Solid-sealed polar pole and circuit breaker

Abstract

The solid-sealed polar pole comprises an insulating shell, an electricity inlet terminal and an electricity outlet terminal are fixedly inserted into the side wall of the insulating shell, a first conductive seat is arranged in a first insulating cavity, the electricity inlet terminal is fixedly connected with the first conductive seat, a second conductive seat is arranged in a second insulating cavity, and the electricity outlet terminal is fixedly connected with the second conductive seat. The electricity outlet terminal is fixedly connected with the second conductive seat, an on-off mechanism used for controlling on-off between the first conductive seat and the second conductive seat is installed in the insulating shell, and a first voltage sensor and a second voltage sensor are installed in the insulating shell; the first voltage sensor and the second voltage sensor are both used for detecting voltage and sending the voltage to the monitoring system, and the first voltage sensor is also used for supplying power to the monitoring system after taking power; the detection end of the first voltage sensor is connected to the first conductive seat or the second conductive seat. The method has the effect of improving the maintenance safety.

Description

Technical Field

[0001] The present application relates to the field of circuit breakers, and in particular to a sealed pole and a circuit breaker. Background Art

[0002] Circuit breakers are generally used in indoor power distribution devices in 3~10kV, 50Hz three-phase AC systems, and are mainly used to make and break the connection between load circuits and power supply circuits.

[0003] At present, the related art discloses a circuit breaker, including a control box and three sealed poles fixedly installed on the top side of the control box. The sealed pole includes an insulating shell, and a vacuum arc extinguishing switch is installed inside the insulating shell. A knife switch is installed on one side of the insulating shell, and a power-in terminal is fixedly installed on the side wall of the insulating shell away from the knife switch. One end of the power-in terminal is used to connect to the power supply circuit, and the other end of the power-in terminal is connected to one end of the vacuum arc extinguishing switch. The other end of the vacuum arc extinguishing switch is connected to the knife switch, and the other end of the knife switch is connected to the load circuit. A first voltage sensor is installed inside the insulating shell, and a second voltage sensor is fixedly installed on one side of the insulating shell close to the knife switch. The detection end of the first voltage sensor abuts against the power-in terminal, and the second voltage sensor abuts against one end of the knife switch close to the insulating shell. The first voltage sensor and the second voltage sensor are both used to detect the voltage and send it to the control box. The control box has a monitoring system and a switch opening and closing switch inside. The monitoring system controls the switch opening and closing control system according to the voltage of the power supply circuit and the load circuit, and the switch opening and closing control system is used to open and close the vacuum arc extinguishing switch and the knife switch.

[0004] Regarding the above-mentioned related technologies, when the circuit needs to be repaired, the vacuum arc extinguishing switch and the knife switch are generally disconnected. After the knife switch is disconnected, the second voltage sensor cannot detect the voltage of the load circuit. If there is some residual power in the load circuit, or the load circuit is powered by two or more power supply circuits, the maintenance personnel may be electrocuted when repairing the load circuit, which poses a safety hazard. Utility Model Content

[0005] In order to improve the safety of maintenance, the present application provides a sealed pole and a circuit breaker.

[0006] The present application provides a sealed pole, which adopts the following technical solution:

[0007] A sealed pole and circuit breaker, comprising an insulating shell, a side wall of the insulating shell having a power input terminal and a power output terminal fixedly inserted therein, a first conductive seat being arranged inside the insulating shell, the power input terminal being fixedly connected to the first conductive seat, a second conductive seat being arranged inside the insulating shell, the power output terminal being fixedly connected to the second conductive seat, an on-off mechanism for controlling the on-off between the first conductive seat and the second conductive seat being installed inside the insulating shell, a first voltage sensor and a second voltage sensor being installed inside the insulating shell, both of which are used to detect voltage and send it to a monitoring system, and the first voltage sensor is also used to supply power to the monitoring system after taking power; when the detection end of the first voltage sensor is connected to the first conductive seat, the detection end of the second voltage sensor is connected to the second conductive seat; when the detection end of the first voltage sensor is connected to the second conductive seat, the detection end of the second voltage sensor is connected to the first conductive seat.

[0008] By adopting the above technical solution, the power input terminal is connected to the power supply circuit, and the power output terminal is connected to the load circuit. After the on-off mechanism disconnects the connection between the first conductive seat and the second conductive seat, the first voltage sensor detects the voltage of one of the power supply circuit and the load circuit and sends it to the monitoring system, and the second voltage sensor detects the voltage of the other circuit and sends it to the monitoring system, thereby facilitating the detection of the residual power of the load circuit after the connection between the load circuit and the power supply circuit is disconnected, thereby improving the safety of maintenance. At the same time, the monitoring system is powered by electricity obtained through the first voltage sensor, thereby reducing the possibility of damage to the power cord due to exposure to sunlight and corrosion by rain when the monitoring system is powered by an external power cord.

[0009] Optionally, a first insulating cavity, a second insulating cavity, a third insulating cavity, a fourth insulating cavity and a connecting cavity are opened inside the insulating shell, and the connecting cavity is connected to the top side of the first insulating cavity and the second insulating cavity, the first conductive seat is located inside the first insulating cavity, and the second conductive seat is located inside the second insulating cavity, the connecting cavity, the first insulating cavity and the second insulating cavity are used to accommodate the on-off mechanism, the first voltage sensor is installed inside the third insulating cavity, and the second voltage sensor is installed inside the fourth insulating cavity.

[0010] By adopting the above technical solution, it is convenient to install the first voltage sensor, the second voltage sensor and the switching mechanism inside the insulating housing.

[0011] Optionally, there is one third insulating cavity, which is opened between the first insulating cavity and the second insulating cavity, and there are two fourth insulating cavities, one of which is opened around the first insulating cavity, and the other of which is opened around the second insulating cavity.

[0012] By adopting the above technical solution, the third insulating cavity is set between the first insulating cavity and the second insulating cavity, so that when producing the sealed pole, the detection end of the first voltage sensor is selected to be connected to the first conductive seat or the second conductive seat. When the detection end of the first voltage sensor is selected to be connected to the first conductive seat, the second voltage sensor is placed in the fourth insulating cavity around the second insulating cavity; when the detection end of the first voltage sensor is selected to be connected to the second conductive seat, the second voltage sensor is placed in the fourth insulating cavity around the first insulating cavity, so as to facilitate the installation of the second voltage sensor.

[0013] Optionally, there are two third insulation cavities and two fourth insulation cavities, one of which is opened around the first insulation cavity, and the other is opened around the second insulation cavity.

[0014] By adopting the above technical solution, according to the first conductive seat and the second conductive seat that the first voltage sensor needs to be connected to, and the first conductive seat and the second conductive seat that the second voltage sensor needs to be connected to, the first voltage sensor is placed inside the corresponding third insulating cavity, and the second voltage sensor is installed inside the corresponding fourth insulating cavity, thereby facilitating the production of the sealed pole.

[0015] Optionally, the switching mechanism includes a conductive bar, a vacuum arc extinguishing chamber, a conductive column, a first driving rod and a second driving rod. The conductive bar is fixedly installed inside the insulating shell, and the vacuum arc extinguishing chamber, the conductive column, the first driving rod and the second driving rod are movably installed inside the insulating shell. One end of the vacuum arc extinguishing chamber is fixedly connected to the conductive bar, and the other end of the vacuum arc extinguishing chamber is fixedly connected to the first driving rod. The rod body of the first driving rod is fixedly connected to the first conductive seat. The first conductive seat is strip-shaped and elastic. One end of the conductive column abuts the conductive bar, and the other end of the conductive column is hinged to the second driving rod. The conductive column slides through the second conductive seat, and the rod body of the conductive column abuts against the second conductive seat.

[0016] By adopting the above technical solution, after the sealed pole is installed in the control box, the opening and closing control system built into the control box will pull the first driving rod and the second driving rod to move, thereby facilitating the control of the on and off between the first conductive seat and the second conductive seat.

[0017] Optionally, a conductive rod is fixedly installed on the side wall of the second conductive seat; when the detection end of the first voltage sensor is connected to the first conductive seat, one side of the first conductive seat abuts against the detection end of the first voltage sensor, and the detection end of the second voltage sensor abuts against the conductive rod; when the detection end of the first voltage sensor is connected to the second conductive seat, one side of the first conductive seat abuts against the detection end of the second voltage sensor, and the detection end of the first voltage sensor abuts against the conductive rod.

[0018] Optionally, the power input terminal and the power output terminal are both covered with a protective bag, one end of the protective bag is fixedly connected to the insulating shell, and the other end of the protective bag is fixedly installed with a hot melt ring.

[0019] By adopting the above technical solution, after the power input terminal is connected to the power supply circuit and the power output terminal is connected to the load circuit, one protective bag wraps the connecting part between the power input terminal and the power supply circuit, and another protective bag wraps the connecting part between the power output terminal and the load circuit, and then the hot melt ring is melted to fix them, thereby playing a protective role and reducing the possibility of damage to the power input terminal and the power output terminal due to exposure to sunlight and rain corrosion.

[0020] Optionally, an inflation head is fixedly mounted on the protection bag, and the protection bag is elastic.

[0021] By adopting the above technical solution, the inflator head fills the insulating gas into the protective bag, thereby expanding the protective bag. The density of the insulating gas inside the protective bag is high, so that the heat generated by the input terminal and the output terminal is easily transferred to the insulating gas. The insulating gas expands due to heat, thereby increasing the surface area of ​​the protective bag, thereby improving the heat dissipation capacity.

[0022] Optionally, it includes a control box and three sealed poles fixedly installed on the top side of the control box.

[0023] By adopting the above technical solution, the circuit breaker is generally used for three-phase electricity, and one phase of electricity is connected through three sealed poles respectively, so as to facilitate the detection of the voltage of each phase of the three-phase electricity.

[0024] Optionally, the detection end of the first voltage sensor of one of the sealed poles is connected to the first conductive seat, and the detection ends of the first voltage sensors of the other two sealed poles are connected to the second conductive seat.

[0025] By adopting the above technical solution, it is convenient to continuously supply power to the monitoring system inside the control box.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. After the on-off mechanism disconnects the connection between the first conductive seat and the second conductive seat, the monitoring system built into the control box can also detect the voltage of the power supply circuit and the load circuit through the first voltage sensor and the second voltage sensor, thereby reducing the residual power in the load circuit, or the load circuit has two or more power supply circuits to supply power, and the maintenance personnel may be electrocuted during maintenance, thereby improving the safety of maintenance;

[0028] 2. Wrap the power input terminal and the power output terminal with a protective bag to reduce the possibility of damage to the power input terminal and the power output terminal due to rain erosion and sunlight exposure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the sealed pole of Example 1 of the present application;

[0030] Figure 2 is a top view of the sealed pole of Example 1 of the present application;

[0031] Figure 3 yes Figure 2 A cross-sectional view of the insulating housing, the first conductive seat and the second conductive seat cut at AA, and a schematic structural diagram of the first voltage sensor abutting against the conductive rod;

[0032] Figure 4 is a bottom view of the sealed pole of Example 1 of the present application;

[0033] Figure 5 is a schematic structural diagram of a circuit breaker according to Embodiment 1 of the present application;

[0034] Figure 6 is a bottom view of the sealed pole of Example 2 of the present application;

[0035] Figure 7 is a bottom view of the sealed pole of Example 3 of the present application;

[0036] Figure 8 is a top view of the sealed pole of Example 4 of the present application;

[0037] Fig. 9 It is an exploded view of Example 4 of the present application.

[0038] Explanation of the reference numerals: 1. insulating shell; 2. power input terminal; 3. power output terminal; 4. first insulating cavity; 5. second insulating cavity; 6. third insulating cavity; 7. fourth insulating cavity; 8. connecting cavity; 9. first conductive seat; 10. second conductive seat; 11. on-off mechanism; 111. conductive bar; 112. vacuum arc extinguishing chamber; 113. conductive column; 114. first driving rod; 115. second driving rod; 12. finger contact spring; 13. transparent part; 14. first voltage sensor; 15. second voltage sensor; 16. inflation head; 17. conductive rod; 18. protective bag; 19. hot melt ring; 20. control box. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-9 This application is described in further detail.

[0040] Example 1.

[0041] The embodiment of the present application discloses a sealed pole and a circuit breaker.

[0042] Reference Figure 1A sealed pole comprises an insulating shell 1, a side wall of the insulating shell 1 is fixedly plugged with an input terminal 2, and a side of the insulating shell 1 away from the input terminal 2 is fixedly plugged with an output terminal 3. The input terminal 2 is used to connect the power supply circuit, and the output terminal 3 is used to connect the load circuit.

[0043] Reference Figure 2 , Figure 3 , a first insulating cavity 4, a second insulating cavity 5 and a connecting cavity 8 are provided inside the insulating shell 1. A first conductive seat 9 is provided inside the first insulating cavity 4, and the first conductive seat 9 is in a strip shape and has elasticity. One end of the first conductive seat 9 is fixedly connected to one end of the input terminal 2 located inside the insulating shell 1. A second conductive seat 10 is provided inside the second insulating cavity 5, and the second conductive seat 10 is in a ring shape, and the circumference of the second conductive seat 10 is fixedly connected to one end of the output terminal 3 located inside the insulating shell 1.

[0044] Reference Figure 3 , Figure 4 One end of the connecting cavity 8 is connected to the top side of the first insulating cavity 4, and the other end of the connecting cavity 8 is connected to the top side of the second insulating cavity 5. The insulating housing 1 is provided with a switching mechanism 11, which includes a conductive bar 111, a vacuum arc extinguishing chamber 112, a conductive column 113, a first driving rod 114 and a second driving rod 115.

[0045] Reference Figure 3 , the conductive bar 111 is fixedly installed inside the connecting cavity 8. The vacuum arc chamber 112 and the first driving rod 114 are located inside the first insulating cavity 4, and the conductive column 113 and the second driving rod 115 are located inside the second insulating cavity 5. One end of the vacuum arc chamber 112 is fixedly abutted against the conductive bar 111, and the other end of the vacuum arc chamber 112 is fixedly connected to the first driving rod 114. The first driving rod 114 is fixedly passed through the first conductive seat 9. One end of the conductive column 113 is abutted against the conductive bar 111, and the other end of the conductive column 113 is hinged to the second driving rod 115. The conductive column 113 is slidably arranged in the second conductive seat 10, and the rod body of the conductive column 113 is in contact with the inner wall of the second conductive seat 10. A finger spring 12 is fixedly installed on the inner wall of the second conductive seat 10, and the finger spring 12 allows the second conductive seat 10 to maintain electrical connection with the conductive column 113, thereby reducing the disconnection between the conductive column 113 and the second conductive seat 10 after wear.

[0046] Pull the first driving rod 114 and the second driving rod 115 downward to disconnect the vacuum interrupter 112, and the conductive column 113 is separated from the conductive bar 111 and disconnected; push the first driving rod 114 and the second driving rod 115 upward to close the vacuum interrupter 112, and the conductive column 113 abuts against the conductive bar 111, so as to facilitate the control of the on-off between the power input terminal 2 and the power output terminal 3.

[0047] Reference Figure 1 The shell is provided with a transparent portion 13, and the transparent portion 13 is used to check the positions of the conductive column 113 and the conductive bar 111 inside the second insulating cavity 5, so as to conveniently ensure whether the conductive column 113 and the conductive bar 111 are disconnected, thereby improving the safety of maintenance.

[0048] Reference Figure 3 , Figure 4 The insulating housing 1 is provided with a third insulating cavity 6 and a fourth insulating cavity 7, and a first voltage sensor 14 is installed inside the third insulating cavity 6. A second voltage sensor 15 is installed inside the fourth insulating cavity 7. The first voltage sensor 14 is a power-taking voltage sensor, so that the first voltage sensor 14 can detect voltage and supply power to the monitoring system. The second voltage sensor 15 is used to detect voltage. The bottom sides of the first insulating cavity 4, the second insulating cavity 5, the third insulating cavity 6 and the fourth insulating cavity 7 are all open, so as to facilitate the installation of the first voltage sensor 14, the second voltage sensor 15 and the on-off mechanism 11.

[0049] Reference Figure 3 , a conductive rod 17 is fixedly installed on the side wall of the second conductive seat 10. When producing the sealed pole, if the detection end of the first voltage sensor 14 needs to be connected to the first conductive seat 9, the top side of the third insulating cavity 6 is connected to the side wall of the first insulating cavity 4, the first conductive seat 9 extends into the part where the third insulating cavity 6 is connected to the first insulating cavity 4, and then the first conductive seat 9 is abutted against the detection end of the first voltage sensor 14. The fourth insulating cavity 7 is opened around the second insulating cavity 5, and then the detection end of the second voltage sensor 15 is abutted against the conductive rod 17, so that the first voltage sensor 14 can detect the voltage of the input terminal 2 and the second voltage sensor 15 can detect the voltage of the output terminal 3.

[0050] When producing the sealed pole, if the detection end of the first voltage sensor 14 needs to be connected to the second conductive seat 10, the top side of the third insulating cavity 6 is connected to the side wall of the second insulating cavity 5, and the conductive rod 17 extends into the portion where the third insulating cavity 6 is connected to the second insulating cavity 5, and then the detection end of the first voltage sensor 14 is abutted against the conductive rod 17. The fourth insulating cavity 7 is opened around the first insulating cavity 4, and the first conductive seat 9 is abutted against the detection end of the second voltage sensor 15, so that the first voltage sensor 14 can detect the voltage of the electric terminal 3 and the second voltage sensor 15 can detect the voltage of the input terminal 2.

[0051] Reference Figure 5A circuit breaker comprises a control box 20 and a sealed pole fixedly mounted on the top side of the control box 20. A monitoring system and a switch-on and switch-off control system are generally provided inside the control box 20. The first voltage sensor 14 and the second voltage sensor 15 are connected to the monitoring system, and the switch-on and switch-off control system is used to control the first drive rod 114 and the second drive rod 115. The first voltage sensor 14 and the second voltage sensor 15 generate a voltage signal according to the detected voltage and send it to the monitoring system. The monitoring system controls the movement of the first drive rod 114 and the second drive rod 115 through the switch-on and switch-off control system according to the voltage signal, thereby realizing the on-off between the power input terminal 2 and the power output terminal 3.

[0052] There are three sealed poles. The detection end of the first voltage sensor 14 of one of the sealed poles is connected to the first conductive seat 9 , and the detection ends of the first voltage sensors 14 of the other two sealed poles are connected to the second conductive seat 10 .

[0053] After the on-off mechanism 11 is disconnected, a first voltage sensor 14 draws power from the power supply circuit to power the monitoring system. During maintenance, the power supply circuit may be connected to the power output terminal 3 and the load circuit may be connected to the power input terminal 2 for reverse connection. When reverse connection is made, the on-off mechanism 11 is disconnected, and two first voltage sensors 14 power supply circuits draw power to power the monitoring system, which is conducive to keeping the monitoring system running.

[0054] The implementation principle of a sealed pole and circuit breaker in an embodiment of the present application is as follows: after the on-off mechanism 11 disconnects the connection between the first conductive seat 9 and the second conductive seat 10, the monitoring system built into the control box 20 can also detect the voltages of the power supply circuit and the load circuit through the first voltage sensor 14 and the second voltage sensor 15, thereby reducing the possibility of electric shock to maintenance personnel when there is residual power in the load circuit or when the load circuit is powered by two or more power supply circuits, thereby improving the safety of maintenance.

[0055] Example 2.

[0056] The embodiment of the present application discloses a sealed pole and a circuit breaker.

[0057] Reference Figure 6 A sealed pole, the difference between the sealed pole of the embodiment of the present application and the embodiment 1 is that there is one third insulating cavity 6, and the third insulating cavity 6 is opened between the first insulating cavity 4 and the second insulating cavity 5. There are two fourth insulating cavities 7, one fourth insulating cavity 7 is opened around the first insulating cavity 4, and the other fourth insulating cavity 7 is opened around the second insulating cavity 5.

[0058] The implementation principle of a sealed pole and circuit breaker in the embodiment of the present application is: the third insulating cavity 6 is set between the first insulating cavity 4 and the second insulating cavity 5, so that the first voltage sensor 14 is connected to the first conductive seat 9 and the second conductive seat 10 at a close distance, thereby facilitating the production of the sealed pole. And when the detection end of the first voltage sensor 14 is selected to be connected to the first conductive seat 9, the second voltage sensor 15 is placed in the fourth insulating cavity 7 around the second insulating cavity 5; when the detection end of the first voltage sensor 14 is selected to be connected to the second conductive seat 10, the second voltage sensor 15 is placed in the fourth insulating cavity 7 around the first insulating cavity 4, thereby facilitating the installation of the second voltage sensor 15.

[0059] Example 3.

[0060] The embodiment of the present application discloses a sealed pole and a circuit breaker.

[0061] Reference Figure 7 , a sealed pole. The difference between a sealed pole in an embodiment of the present application and embodiment 1 is that there are two third insulating cavities 6 and four fourth insulating cavities 7, one third insulating cavity 6 and one fourth insulating cavity 7 are both opened around the first insulating cavity 4, and the other third insulating cavity 6 and the other fourth insulating cavity 7 are both opened around the second insulating cavity 5.

[0062] The implementation principle of a sealed pole and a circuit breaker in an embodiment of the present application is as follows: two third insulating cavities 6 and two fourth insulating cavities 7 are set during production, and then the first voltage sensor 14 and the second voltage sensor 15 are placed in the corresponding third insulating cavity 6 and the fourth insulating cavity 7 according to the positions of the first conductive seat 9 and the second conductive seat 10 to which the first voltage sensor 14 and the second voltage sensor 15 need to be connected, thereby improving the versatility of the sealed pole.

[0063] Example 4.

[0064] The embodiment of the present application discloses a sealed pole and a circuit breaker.

[0065] Reference Figure 8 , Fig. 9 A sealed pole, a sealed pole of the embodiment of the present application is different from the embodiment 1 in that the power input terminal 2 and the power output terminal 3 are both covered with a protective bag 18, and the protective bag 18 is elastic. One end of the protective bag 18 is fixedly connected to the insulating shell 1, and the other end of the protective bag 18 is fixedly installed with a hot melt ring 19. The protective bag 18 is fixedly installed with an inflation head 16.

[0066] The implementation principle of the sealed pole and circuit breaker of the embodiment of the present application is as follows: after the power input terminal 2 is connected to the power supply circuit and the power output terminal 3 is connected to the load circuit, the protection bag 18 is used to wrap the power output terminal 3 and the power input terminal 2, and then the hot melt ring 19 is melted to fix them, thereby reducing the damage of the power output terminal 3 and the power input terminal 2 caused by sunlight exposure and rain erosion.

[0067] Then, insulating gas is filled into the protective bag 18 through the inflation head 16, and the density of the insulating gas inside the protective bag 18 increases, so that it is convenient for the power output terminal 3 and the power input terminal 2 to dissipate heat to the insulating gas. After the insulating gas expands due to heat, the surface area of ​​the protective bag 18 increases, so as to facilitate improving the heat dissipation effect.

[0068] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A sealed pole, characterized in that: The invention comprises an insulating shell (1), a side wall of which is fixedly plugged with an input terminal (2) and an output terminal (3), a first conductive seat (9) is arranged inside the insulating shell (1), the input terminal (2) is fixedly connected to the first conductive seat (9), a second conductive seat (10) is arranged inside the insulating shell (1), the output terminal (3) is fixedly connected to the second conductive seat (10), an on-off mechanism (11) for controlling the on-off between the first conductive seat (9) and the second conductive seat (10) is installed inside the insulating shell (1), and a second conductive seat (10) is installed inside the insulating shell (1). A voltage sensor (14) and a second voltage sensor (15), wherein the first voltage sensor (14) and the second voltage sensor (15) are both used to detect voltage and send it to a monitoring system, and the first voltage sensor (14) is also used to supply power to the monitoring system after taking electricity; when the detection end of the first voltage sensor (14) is connected to the first conductive seat (9), the detection end of the second voltage sensor is connected to the second conductive seat (10); when the detection end of the first voltage sensor (14) is connected to the second conductive seat (10), the detection end of the second voltage sensor is connected to the first conductive seat (9).

2. The sealed pole according to claim 1, characterized in that: The insulating shell (1) is provided with a first insulating cavity (4), a second insulating cavity (5), a third insulating cavity (6), a fourth insulating cavity (7) and a connecting cavity (8); the connecting cavity (8) is connected to the top sides of the first insulating cavity (4) and the second insulating cavity (5); the first conductive seat (9) is located inside the first insulating cavity (4); the second conductive seat (10) is located inside the second insulating cavity (5); the connecting cavity (8), the first insulating cavity (4) and the second insulating cavity (5) are used to accommodate a switching mechanism (11); the first voltage sensor (14) is installed inside the third insulating cavity (6); and the second voltage sensor (15) is installed inside the fourth insulating cavity (7).

3. The sealed pole according to claim 2, characterized in that: There is one third insulating cavity (6), and the third insulating cavity (6) is opened between the first insulating cavity (4) and the second insulating cavity (5). There are two fourth insulating cavities (7), one of which is opened around the first insulating cavity (4), and the other of which is opened around the second insulating cavity (5).

4. The sealed pole according to claim 2, characterized in that: There are two third insulating cavities (6) and two fourth insulating cavities (7), one of which is opened around the first insulating cavity (4), and the other is opened around the second insulating cavity (5).

5. The sealed pole according to claim 1, characterized in that: The switching mechanism (11) comprises a conductive bar (111), a vacuum arc extinguishing chamber (112), a conductive column (113), a first driving rod (114) and a second driving rod (115); the conductive bar (111) is fixedly mounted inside the insulating housing (1); the vacuum arc extinguishing chamber (112), the conductive column (113), the first driving rod (114) and the second driving rod (115) are all movably mounted inside the insulating housing (1); one end of the vacuum arc extinguishing chamber (112) is fixedly connected to the conductive bar (111); The other end of the arc extinguishing chamber (112) is fixedly connected to the first driving rod (114); the rod body of the first driving rod (114) is fixedly connected to the first conductive seat (9); the first conductive seat (9) is strip-shaped and elastic; one end of the conductive column (113) abuts against the conductive row (111); the other end of the conductive column (113) is hinged to the second driving rod (115); the conductive column (113) slides through the second conductive seat (10); the rod body of the conductive column (113) abuts against the second conductive seat (10).

6. The sealed pole according to claim 5, characterized in that: A conductive rod (17) is fixedly mounted on the side wall of the second conductive seat (10); when the detection end of the first voltage sensor (14) is connected to the first conductive seat (9), one side of the first conductive seat (9) abuts against the detection end of the first voltage sensor (14), and the detection end of the second voltage sensor (15) abuts against the conductive rod (17); when the detection end of the first voltage sensor (14) is connected to the second conductive seat (10), one side of the first conductive seat (9) abuts against the detection end of the second voltage sensor (15), and the detection end of the first voltage sensor (14) abuts against the conductive rod (17).

7. The sealed pole according to claim 1, characterized in that: The power input terminal (2) and the power output terminal (3) are both covered with a protective bag (18), one end of the protective bag (18) is fixedly connected to the insulating shell (1), and the other end of the protective bag (18) is fixedly mounted with a hot melt ring (19).

8. The sealed pole according to claim 7, characterized in that: The protective bag (18) is fixedly mounted with an inflation head (16), and the protective bag (18) is elastic.

9. A circuit breaker using a sealed pole according to any one of claims 1 to 8, characterized in that: It comprises a control box (20) and three sealed poles fixedly mounted on the top side of the control box (20).

10. A circuit breaker according to claim 9, characterized in that: The detection end of the first voltage sensor (14) of one of the sealed poles is connected to the first conductive seat (9), and the detection ends of the first voltage sensors (14) of the other two sealed poles are connected to the second conductive seat (10).

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